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Convertible Subordinated Notes (Tables)
 3 Months Ended
Mar. 31, 2015
Convertible Subordinated Notes [Abstract]  
Schedule of Liability and Equity Components of Convertible Subordinated Notes
The carrying values of the liability and equity components of the Notes at December 31, 2014 and March 31, 2015 are reflected in our Consolidated Balance Sheets as follows (in thousands):
 
December 31, 2014
 
March 31, 2015
Long-term liabilities:
 
 
 
Principal amount
$
143,750

 
$
143,750

Unamortized discount of liability component
(29,208
)
 
(28,381
)
Carrying value of the liability component
$
114,542

 
$
115,369

 
 
 
 
Equity component carrying value
$
17,973

 
$
17,973